Electric time-alarm.



No. 863,570. PATENTBD AUG.13, 1907.l J. L. GRASS, W. K. 000K, c. W. FLETCHER & F. J. ARNDT.

ELBGTRIG TIME ALARM.

APPLICATION FILED AUGJ, 1906.

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J. L. GRASS, W. K. 000K, o. W. FLETCHER & P. J. ARNm?. ELECTRIC TIME ALARM.

APPLICATION FILED AUG.1,1906.

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' UNITED STATES PATENT oEEroE.

JACOB L.I GRASS, WALTER K. COOK, CHARLES W. FLETCHER, AND FREDERICII J. ARNDT, OF

MINNEAPOLIS, MIN NESOTA,ASSIGNORS TO AMERICAN BANK PROTECTION CO., OF MIN- NEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

ELECTRIC TIME-ALARM.

Specilcation of Letters Patent.

Patented Aug. 13,- 1907.

Application filed August 1,1906. Serial No. 328.716.

,To all whom 'it may concern:

- Be it known that we, JACOB L. Gnnss, WALTER K. COOK, CHARLES W. FLETCHER, and FREDERICH J.v AuNDT, oi Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Electric Time-Alarms, of which thev cui-ted and the gong begins to ring, it will continue to whereby the ringing time sound the alarm until the batteries are worn out or until someone has broken thecircnit through the time mechanism. In eases oi attempted burglary, when the alarm has been sounded, or when the gong has been rung through some accident to the' system, a long period frequently interveues between the intial ringing of the gong and the time when a person arrives with sufliy cien't knowledge of the system to reset the clock and Such long continued ringing of the stop the gong. gong is undesirable as it not only weakens the battery but also causes an unnecessary disturbance. The object, therefore, of our invention is to provide means for automatically checking the ringing ol' the gong alter a certain interval oi time.

Our invention consists generally in providing means in connection with a general alarm circuit whereby when the gong has rung i'or a predetermined-period oi time the circuit will be broken and the gong stopped.

.1"urtl1er, the invention consists in providing means or period of the gong may be varied.

In the accompanying drawing, forming part oi this specification, Figure 1 is a rear view oi a time piece lwith the casing broken away, illustrating the interior construction. Fig. 2 is a plan view looking down on the top of the circuit breaking mechanism. Fig. 3 illustrates the position of the parts after the drop eircuit `has been openedand the mechanism set in mo tion to open the general alarm circuit. Fig. 4 is a similar view illustrating the drop circuit closed and the general alarm circnitopen. Fig. 5 is-a sectional view illustrating the vertically moving frame which supports the mechanism for opening the alarm circ'uit.

In the drawing, 2 represents a time piece casing having its mechanism connected in any suitable way with the conductors of the general alarm system. The circuit `closed through this systemby'means of brushes 3, 4 and 5 arranged in pairs (see Fig. 5), and mounted on an insulating block 6 and adapted to engage contact points 7, 8 and 9, also mounted on a block 10 and connected with conductors l1, 12 and 13, which lead to suitable binding posts 14, l5 and 16, and from thence to the vault door or lining. We make no claim in this application' to this general alarm system and I hence it is unnecessary to illustrate or describe its complete system of wiring.

Conductors 17, 18 and 19 are also provided, leading to Contact points 20, 21 and 22 from binding posts 23, 24 and 25. The contact point 22has a plate 2G carrying a screw 27 which bears on a plate 28 hinged at 29 and having a notch or recess 30 to receive a hook 31 on the lower end of the armature 32 of the circuit closer 33. This circuit closer has its magnets cut into the'alarn circuit through conductors 34 and plate 28, andil't'onductor leading ironrthe said plate to the magnets, and when the alarm circuit is short-circuited and the current ows therethrough, the magnets of the circuit closer will bc energized to attract the armature 32 and release the plate 28. 'lhis plate carries an adjust-able screw 36- which engages a lug 37 on the lower end of a plate 38 that is vertically slidable by means of slots 39 and screws 40 passing therethrough. The plate 38 also has a centrally arranged slot 41 to receive a pinion 42 on the hour hand post 4S of the clock. An idle gear 44 is mounted on the plate 38 above the said pinion and is normally held up out. of Contact with the pinion,' but when the plate 28 is released and is allowed to drop by gravity, the gear will engage the teeth ofthe pinion and be driven thereby. An arm 45 is rigidly mounted on the gear 44 and by means of holes 46 in the plate 38 and the adjustable pin 47 the position ol' the arm 45 with respect to its support can be varied, being either raised or lowered according to which hole 46 the stop pin 47 is thrust into.

The upper end of the plate 38 carries a screw 48 adapted to slide in a plate 49 and provided with lock nuts 50 for regulating its travel in said plate. The plate 49 is hingedvat 51 at one end and carries the insulating block 6 at its other end and is provided with an interniediate notch 52 engaged by a dog 53. A spring 54 normally holds the plate 49, the insulating block 6 and the brushes thereon in an elevated position to break the general algu-ni circuit. A lever 54 is pivotcd at 55 and has an arm 5G extending across the plate 49, said lever 54/ being operated by means of a lever 57 which extends I 50 and causethe upward movement ot' the plate 38 and the separation of the gear 44 from the pinion 42. `When the circuit closer magnets have been energized and the plate 2S released the plate 38 will vdrop and allow the gear 44 to mesh with the pinion 42 and be revolved '.thereby. This closing of the circuit through 'the drop `vill occur the moment the gong begins to ring, and the plate 38 will drop and the gear 44 will begin to rotate the same instant and the ringing o the gong will continue until the arm 45 has engaged the pin 58 when the general alarm circuit will be broken and the gong will cease ringing. By adjusting the stop pin and raising or lowering the arm its travel may be varied to slierten 1 0r lengthen the ringing period ot' the gong before the Valarm circuit is broken.

We claim as our invention'.

i. 'lhe combination, with n time piece. ot' a normally open electric alarm circuit means for closinf.; said alarm circuit anducausing the alarm to besoundcd' and means whereby said circuit will he opened and the soundim.; ot the alarm automatically checked a predetermined interval after the initial operation ot' the alarm. substantiall)Y as described.

L. The combination, with a time piece, of an electric alarm circuit, n circuit closer having a drop ,'onnccted with said alarm circuit and released by the passage of thevcurrent through said alarm circuit, and means whe'reby said alarm circuit `will.bc broken and the sounding of the alarm checked a predetermined interval after the operation of said circuit closer and the release of said drop, substantially ns described.

It. The combination, with a time mechanism of an electric alarm circuit closed through said .time piece during predetermined intervals and arranged when sliort-circuited to sound an alarm, a circuit closer having a drop connected with said alarm circuit, and means released by the operation of said circuit closer for checking; the sounding -ot said alarm ti predetermined' interval after its initial operation. I

4. 'ihe Icombination, with a time piece, of un electric alarm circuit closed during a predetermined lnterval 'of :l circuit time, a gear mechanism normally inoperative but arranged to move into engagement with the time piece geur to be driven thereby, means actuated when the alarm is sounded for releasing,r said gear mechanism. and means controlled by the movement of said geur mechanism for checking said alarm after a period of time from its initial operation, sub.` intially as described.

5. 'lhe combination. with a time piece haring :i revolv ing pinion. ot' an electric ulnrm circuit closed through said time piece duringr a predetermined period. a sliding frame. a ucar wheel carried thereby und normally idle, 1in arm carried b r said geur wheel, means operated b v said arm for brcaliiincr said alarm circuit :i predetermined interval at'lcr the engagement. ot' aid gear with said pinion and means connected with said alarm circuir and actuated when the initial alarm is sounded for releasing said frame and allowingr said gear to engage said pinion, substantially as described.

Il. 'lhc combination, with a time piece havim.r a revolvincI pinion. ot an electric alarm circuit. o sliding frame. :i gear mounted thereon and adapted to engage d pinion. closer connected with said alarm circuit. and having a drop i inged to normall \l hold said i'rumc in :in elevated position and said g out oi'- engagement willi sani pinion. an arui carried by said gear. and means in the path of said arm for breaking' said -alilrm circuit when engaged thereby. substantially as described.

T. 'lhe combination, willi :i time piece. of an electric alarm circuit having' a series oi' movable brushes and contact points therefor. u hinged plate supporting,l said brushes. a spring, normally holding said plate in a raised position and said brushes out of contact with said points. a dog adapted to engage said plate and lock said brushes in engagement willi said points, and means released upon the initial sounding ot' the alarm for tripping said dog and breakingsaid alarm circuit after a predetermined interval, substantially as described. l

N. l'he combination, with a time piece, of an electric alarm circuit, n circuit closer arranged to be actuated by the passage oi a current through said alarm circuit, and means whereby said alarm circuitv will beopcned and the alarm checked at a predetermined period after the operation of the alarm.

in witness whoreowe have hereunto set ourhand this Utli day of July 1906. I

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